JPH04364909A - Resin binder containing molded body - Google Patents

Abstract

PURPOSE:To manufacture a molded body by pulverizing waste, unnecessary and volume reduction treated thermoplastic and utilizing same as a binder for various kinds of molded bodies and also by utilizing a waste thermosetting resin molded body as a reinforcing substance and/or a filling substance. CONSTITUTION:A resin binder containing molded body is composed of resin powder (A) prepared by pulverizing volume reduction treated thermoplastic resin and foaming styrol powder sheared and pulverized by a crushing device provided with a rotating drum with a number of teeth. The foaming styrol powder contains foaming styrol powder (B) of the powder size to be able to pass through a screen of 1mm mesh by 60% or more efficiency and also passing through a screen of 6.73mm mesh by 100% efficiency and a reinforcing substance and/or a filler (C).

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention uses a powder obtained by reducing the volume of waste material or unnecessary thermoplastic resin and then pulverizing it.
The present invention relates to a molded body using special powder of waste or unnecessary styrofoam material as a binder, and a molded body using flakes or powder of a waste thermosetting resin molded body as a reinforcing material and/or filler.

0002

[Prior Art/Problems] Recently, establishing a technology for reprocessing and reusing waste materials or unnecessary plastics has become an important issue. The present inventors have already proposed a technique in which waste Styrofoam material is specially treated and used as a binder (Japanese Patent Application No. 3-47291). On the other hand, one of the methods that has recently been used as waste plastic processing technology is volume reduction processing. However, volume reduction treatment only reduces the volume of waste plastic, and little progress has been made in reusing waste plastic that has been subjected to volume reduction treatment. As for the thermoplastic resin subjected to the volume reduction treatment, one possible reuse method is to pulverize it and use it as a binder for molded bodies. However, if the material is simply powdered, there is a problem in that it is difficult to obtain sufficient uniformity when it is mixed with reinforcing substances and/or fillers and molded. Furthermore,
Reprocessing and reusing waste materials or unnecessary thermosetting resin moldings is also an important issue.

[0003] Therefore, an object of the present invention is to provide a molded article which is made by powdering waste material or unnecessary thermoplastic resin and used as a binder for various molded articles. It is an object of the present invention to provide a molded body using a waste material of a resin molded body as a reinforcing material and/or a filling material.

0004

[Means for Solving the Problems] A resin binder-containing molded article according to the present invention comprises a resin powder (A) obtained by pulverizing a volume-reduced thermoplastic resin and a rotating drum having a large number of teeth. A styrofoam powder sheared and pulverized by a pulverizer having a pulverizer having a mesh size of 1
60% or more passes through a mm sieve and has a mesh size of 6.73
Styrofoam powder (B) with dimensions that allow 100% passage through a mm sieve and reinforcing substances and/or fillers (C)
It is characterized by containing the following.

[0005]

[Operation] The resin powder (A) used in the present invention is a powdered thermoplastic resin that has been subjected to volume reduction treatment, and has a 100%
Any material can be used as long as it can be compressed, heated, and molded in the range of ~250°C.

[0006] Next, the styrofoam material that is the raw material for the styrofoam powder (B) used in the present invention is a heat insulating material,
There are no particular limitations on the material, as long as it is a commonly used polystyrene foam material used for packaging materials, etc., and any form may be used.

The foamed polystyrene powder (B) can be obtained by shearing and crushing the foamed polystyrene material as described above using a crushing device having a rotating drum with a large number of teeth. In this crushing step, the expanded polystyrene powder (B) is shear-pulverized to a size that allows 60% or more to pass through a sieve with an opening of 1 mm and 100% through a sieve with an opening of 6.73 mm. The foamed polystyrene powder (B) obtained in this way has an irregular shape, and when producing a molded object, it can be mixed uniformly in the mixing process of raw materials, and in the molding process, the uniformity of the mixed raw materials can be improved. is sufficiently retained, making it possible to obtain a uniform molded product.

[0008] If the dimensions of the expanded styrene powder (B) exceed the above range, the repulsive force of the styrene powder increases and the specific surface area of the styrene powder decreases.
This is undesirable because there is little entanglement between the powders, and when used as a binder, molten polystyrene foam tends to form undesirable pores. Furthermore, even if the volume-reduced thermoplastic resin powder or the treated expanded polystyrene powder contains impurities, there is no particular problem as long as they do not have a detrimental effect on molding.

Next, reinforcing material and/or filler (C)
can be used regardless of whether it is organic or inorganic, and can be in the form of fibers or flakes. Examples of fibrous reinforcing substances include inorganic fibers such as glass fibers, wood fibers such as coniferous trees and hardwoods, vegetable fibers such as bamboo fibers, synthetic fibers such as PVA and PAN, and acicular substances such as wollastonite. In addition, as flake-like reinforcing materials, organic materials such as wood flakes,
Examples include inorganic materials such as mica flakes. Furthermore, suitable fillers include lightweight aggregates such as perlite, calcium silicate powder, and waste materials such as rice husks and sawdust.

[0010] In addition to these conventional reinforcing substances and/or fillers, flaked or powdered thermosetting resin moldings can be used in the molded product of the present invention. This is made by flaking or powdering waste material or unnecessary thermosetting resin or thermosetting resin composite material, and its size is not particularly limited.

[0011] Here, the mixing ratio of the above components (A) to (C) is as follows: resin powder (A) and expanded polystyrene powder (B).
The proportion of the expanded polystyrene powder (B) in the total amount of is 5% or more by weight, and the resin powder (A), the expanded polystyrene powder (B), and the reinforcing substance and/or filler (C)
The total amount of the resin powder (A) and the expanded polystyrene powder (B) in the total amount is 10 to 75% by weight. In addition,
The proportion of expanded polystyrene powder (B) in the total amount of resin powder (A) and expanded polystyrene powder (B) is 5% by weight
If it is less than that, sufficient uniformity cannot be maintained during mixing, stirring, and molding, which is not preferable.

The molded article of the present invention can be produced by adding and blending the above-mentioned components and then compressing and heating the mixture. Here, the above Styrofoam powder binder is not spherical but has a quasi-fibrous shape with countless branches protruding from it, so when mixed with other components as a binder, the branches entangle with other components and mix uniformly. can do. Further, in the subsequent mat molding and compression heat treatment steps, the uniformity of the mixed raw materials is sufficiently maintained, so it is possible to prevent variations in the molded product due to non-uniformity of the binder. Note that the mixing operation is not particularly limited, and can be performed by a conventional operation. The mixing order of each component is not particularly limited, but the resin powder (A) and the expanded polystyrene powder (B) are mixed in advance,
An efficient method is to then mix the mixture of resin powder (A) and expanded polystyrene powder (B) with the reinforcing substance and/or filler.

[0013] Next, regarding the compression heating operation, the heating temperature cannot be absolutely defined depending on the holding time, the thickness of the raw material mat, etc., but it is usually preferable to heat in the range of 100 to 250°C. If the heating temperature is less than 100°C, sufficient molding cannot be performed, and if it exceeds 250°C, the expanded polystyrene powder binder will deteriorate, which is not preferable. Further, the compression pressure is determined by the bulk specific gravity of the intended product, but there is no particular problem with the molding itself as long as it is 2 kg/cm2 or more.

[0014] The resin binder-containing molded article of the present invention can be remolded when it is used as waste or becomes unnecessary, so it is also effective in terms of resource recycling.

[0015]

[Example] Example 1 Preparation of resin powder (A) Styrofoam that had been volume-reduced using a jet steam packer manufactured by Sigma Kiki Co., Ltd. was crushed to 0 mesh using a crusher.
．． The powder was pulverized until it passed through a 25 mm sieve. Preparation of Styrofoam Powder (B) Styrofoam material roughly crushed into pieces approximately 5 to 20 cm square was heated for approximately 1000 r with a drum diameter of 500 mm, drum effective length of 900 mm, and a drum with many blade-like teeth on the drum.
pm, fed through a hopper, and sheared and ground. The foamed polystyrene powder obtained by this treatment passed through a sieve with an opening of 1 mm at 81%, and
．． It had dimensions that allowed 100% passage through a 73 mm sieve.

A resin binder-containing molded article of the present invention was prepared using the blending ratios shown in Table 1 below. First, resin powder (A) and styrofoam powder (B) are mixed into 2 parts using a mixer.
Bamboo fibers and FRP flakes are added to the resulting mixture and mixed for an additional 5 minutes. Next, the obtained mixture was made into a uniform mat shape on an iron plate, and this was compressed and heated using a hot press to shape it. Various properties of the obtained molded product are also listed in Table 1.

[0017]

[Table 1]
(Formulation:
weight%)
Example Comparative example
1 2 3 Resin powder (A)
30 30 40 Styrofoam powder (B) 10 1
0 Bamboo fiber (*1)
60 45 60FRP flakes (*2)
15 Press pressure (kg/cm2)
15 15 15 Heating temperature (℃
) 200
200 200 Bulk density (g/cm3) (
*3) 0.49 0.51
0.50 bending strength (kg/cm2) (*3)
48 43 28 Note: (*1
) = Bamboo fiber produced by the method described in Japanese Patent Application No. 2-402672. (*2) = FRP waste material cut into flakes. (*3) = Measured according to JIS A 5908.

[0018]

According to the present invention, volume-reduced thermoplastic resins, expanded polystyrene containers, etc., whose disposal is currently a problem, can be effectively reused as binders for building materials, molded objects, etc. Additionally, thermosetting resins, composites thereof, and the like can be effectively reused as reinforcing substances and/or fillers.

Claims (3)

[Claims] 1. A resin powder (A) obtained by pulverizing a volume-reduced thermoplastic resin, and a styrofoam powder sheared and pulverized by a pulverizer having a rotating drum with a large number of teeth, comprising: The styrofoam powder has a mesh opening of 1 m.
6.73 m sieve and 6.73 m sieve.
1. A resin binder-containing molded article, characterized in that it contains expanded polystyrene powder (B) having a size that allows 100% of the material to pass through a sieve of 500 mm, and a reinforcing substance and/or filler (C). 2. The resin binder-containing molded article according to claim 1, wherein a flaked or powdered thermosetting resin molded article is used as the reinforcing substance and/or filler. 3. The proportion of the expanded polystyrene powder (B) in the total amount of the resin powder (A) and the expanded polystyrene powder (B) is 5% or more by weight, and the resin powder (A) and the expanded polystyrene powder (B) are Claim 1: The total amount of the resin powder (A) and the expanded polystyrene powder (B) in the total amount of the powder (B) and the reinforcing substance and/or filler (C) is 10 to 75% by weight. The resin binder-containing molded article described above.